公开(公告)号：US20180000424A1

公开(公告)日：2018-01-04

申请号：US15198438

申请日：2016-06-30

Applicant: ANALOG DEVICES, INC.

Inventor： SEFA DEMIRTAS ,  JASON D. KING ,  ROBERT ADAMS ,  TONY JOSEPH AKL ,  JEFFREY G. BERNSTEIN

IPC: A61B5/00 ,  A61B5/11 ,  A61B5/024

CPC classification number: A61B5/7257 ,  A61B5/02416 ,  A61B5/1118 ,  A61B5/1123 ,  A61B5/6802 ,  A61B5/681 ,  A61B5/7207 ,  A61B5/7221

Abstract: Activity monitors and smart watches utilizing optical measurements are becoming widely popular, and users expect to get an increasingly accurate estimate of their heart rate (HR) from these devices. These devices are equipped with a light source and an optical sensor which enable estimation of HR using a technique called photoplethysmography (PPG). One of the main challenges of HR estimation using PPG is the coupling of motion into the optical PPG signal when the user is moving randomly or exercising. The present disclosure describes a computationally feasible and fast HR estimation algorithm to be executed at instances of little or no motion. Resulting HR readings may be useful on their own, or be provided to systems that monitor HR continuously to prevent the problem of such systems being locked on an incorrect HR for long periods of time. Implementing techniques described herein leads to more accurate HR measurements.

公开(公告)号：US20160354038A1

公开(公告)日：2016-12-08

申请号：US15170373

申请日：2016-06-01

Applicant: ANALOG DEVICES, INC.

Inventor： SEFA DEMIRTAS ,  ROBERT ADAMS ,  JEFFREY G. BERNSTEIN ,  NOAH DANIEL STEIN ,  DAVID WINGATE

IPC: A61B5/00 ,  A61B5/0245 ,  A61B5/0255 ,  A61B5/024

CPC classification number: A61B5/721 ,  A61B5/02416 ,  A61B5/02438 ,  A61B5/725 ,  A61B2562/0219

Abstract: Heart rate monitors are plagued by noisy photoplethysmography (PPG) data, which makes it difficult for the monitors to output a consistently accurate heart rate reading. Noise is often caused by motion. Using known methods for processing accelerometer readings that measure movement to filter out some of this noise may help, but not always. The present disclosure describes an improved filtering approach, referred to herein as an iterative frequency-domain mask estimation technique, based on using frequency-domain representation (e.g. STFT) of PPG data and accelerometer data for each accelerometer channel to generate filters for filtering the PPG signal from motion-related artifacts prior to tracking frequency of the heartbeat (heart rate). Implementing this technique leads to more accurate heart rate measurements.

Abstract translation: 心率监测器受到嘈杂的光谱体积描记术（PPG）数据的困扰，使得监测仪难以输出一致的心率读数。 噪音通常由运动引起。 使用已知的处理加速度计读数的方法来测量移动以滤除某些噪声可能有助于，但不总是。 本公开描述了基于使用PPG数据的频域表示（例如STFT）和每个加速度计通道的加速度计数据来生成用于过滤PPG的滤波器的改进的滤波方法（这里称为迭代频域掩模估计技术） 在跟踪心跳频率（心率）之前的运动相关假象的信号。 实施这种技术导致更准确的心率测量。

公开(公告)号：US20160097846A1

公开(公告)日：2016-04-07

申请号：US14875022

申请日：2015-10-05

Applicant: ANALOG DEVICES, INC.

Inventor： MIKAEL MORTENSEN ,  ERIC G. NESTLER ,  J. BRIAN HARRINGTON ,  JEFFREY G. BERNSTEIN

IPC: G01S7/52

CPC classification number: G01S7/52017 ,  G01S7/52034 ,  G01S7/5208 ,  G01S15/8915 ,  G10K11/346

Abstract: A system for ultrasound beamforming is provided, including a sampled analog beamformer, an array of ultrasound transducers, and a high voltage amplifier coupled to the sampled analog beamformer and the array of ultrasound transducers. The sampled analog beamformer includes a sampled analog filter for filtering an incoming analog signal and adding a fractional delay, and transmitting a filtered analog ultrasound signal. The array of ultrasound transducers further transmits the filtered analog ultrasound signal. The high voltage amplifier drives transducers in the array of ultrasound transducers.

Abstract translation: 提供了一种用于超声波波束形成的系统，包括采样的模拟波束形成器，超声波换能器的阵列以及耦合到采样的模拟波束形成器和超声换能器阵列的高压放大器。 采样的模拟波束形成器包括一个采样的模拟滤波器，用于对输入的模拟信号进行滤波，并增加分数延迟，并传输滤波的模拟超声信号。 超声波换能器的阵列进一步发射经滤波的模拟超声信号。 高压放大器驱动超声波换能器阵列中的换能器。

公开(公告)号：US20170017892A1

公开(公告)日：2017-01-19

申请号：US15154113

申请日：2014-10-15

Applicant: ANALOG DEVICES, INC.

Inventor： JEFFREY G. BERNSTEIN ,  DAVID WINGATE ,  JOHN REDFORD

IPC: G06N7/00

CPC classification number: G06N7/005 ,  G06F17/18

Abstract: The disclosed apparatus and methods include a reconfigurable sampling accelerator and a method of using the reconfigurable sampling accelerator, respectively. The reconfigurable sampling accelerator can be adapted to a variety of target applications. The reconfigurable sampling accelerator can include a sampling module, a memory system, and a controller that is configured to coordinate operations in the sampling module and the memory system. The sampling module can include a plurality of sampling units, and the plurality of sampling units can be configured to generate samples in parallel. The sampling module can leverage inherent characteristics of a probabilistic model to generate samples in parallel.

Abstract translation: 所公开的装置和方法分别包括可重构采样加速器和使用可重构采样加速器的方法。 可重构采样加速器可适用于各种目标应用。 可重构采样加速器可以包括采样模块，存储器系统和被配置为协调采样模块和存储器系统中的操作的控制器。 采样模块可以包括多个采样单元，并且多个采样单元可被配置为并行地产生采样。 抽样模块可以利用概率模型的固有特征来并行生成样本。

公开(公告)号：US20160317096A1

公开(公告)日：2016-11-03

申请号：US14972368

申请日：2015-12-17

Applicant: ANALOG DEVICES, INC.

Inventor： ROBERT ADAMS ,  SEFA DEMIRTAS ,  JEFFREY G. BERNSTEIN

IPC: A61B5/00 ,  A61B5/024

CPC classification number: A61B5/721 ,  A61B5/02416 ,  A61B5/02438 ,  A61B5/11 ,  A61B5/725 ,  A61B5/7275 ,  A61B2562/0219 ,  A61B2562/0233 ,  G06F19/00

Abstract: Heart rate monitors are plagued by noisy photoplethysmography (PPG) data, which makes it difficult for the monitors to output a consistently accurate heart rate reading. Noise is often caused by motion. Using known methods for processing accelerometer readings that measure movement to filter out some of this noise may help, but not always. The present disclosure describes an improved front-end technique (time-domain interference removal) based on using adaptive linear prediction on accelerometer data to generate filters for filtering the PPG signal prior to tracking the frequency of the heartbeat (heart rate). The present disclosure also describes an improved back-end technique based on steering the frequency of a resonant filter in order to track the heartbeat. Implementing one or both of these techniques leads to more accurate heart rate measurements.

Abstract translation: 心率监测器受到嘈杂的光谱体积描记术（PPG）数据的困扰，使得监测仪难以输出一致的心率读数。 噪音通常由运动引起。 使用已知的处理加速度计读数的方法来测量移动以滤除某些噪声可能有助于，但不总是。 本公开描述了基于在加速度计数据上使用自适应线性预测来生成用于在跟踪心跳频率（心率）之前对PPG信号进行滤波的滤波器的改进的前端技术（时域干扰消除）。 本公开还描述了基于转向谐振滤波器的频率以便跟踪心跳的改进的后端技术。 实施这些技术中的一种或两种导致更准确的心率测量。